Bought this for my SE mobile (works with any SE phone that has a fast-port connector)and it really blasts the music out, getting the most out of your Walkman phone (tried it with W395 and W595).It's a great alternative to any bulky Hi-Fi system and easily carried around when travelling.The sub-woofer really adds that deep backround base giving it a real Hi-Fi experience.However, the surround sound function justs lowers the volume and comes out tinny, so it's best kept in normal stereo mode.Overall,a great portable music system.